Isosceles triangle 8

If the rate of the sides an isosceles triangle is 7:6:7, find the base angle correct to the nearest degree.

Correct result:

B =  65 °

Solution:

a=7 b=6  cosB=b/2:a  B=180πarccos(b/2a)=180πarccos(6/27)=65=643723"

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